Machine-tool.



No. 869-588. PATENTED OCT. 29. 19'07. r. MLLER.

MAOHINE TOOL.

APPLIOATION FILED MAY 11 1904.

SEBETS-SH ET l.

No. 869588. PATENTED OCT. 29. 1907. F. MULLER.

MACHINE TOOL.

APPLIOATION PILED MAY 11. 1904.

2 BHEETS-SHEET 2.

W/TNESSES: NVE/VTOR FRIEDERIOH MULLER, oF ELIZABETH, NEW JERSEY.

MACHINE-TOL.

No. 8693588. i

Speeification of Letters Patent.

Patented Oct. 29, 1907.

Application' filed Ma 11. 1904. Serial No. 207.506.

To all whom 'it may concem:

Be it known that I, FmEDnRIcH MLLER, a citizen of the United States,residing at Elizabeth, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in Machine-Tools, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

This invention relates to an improvement designed particularly forenbodiment in that class of machine tools wherein the force with whichthe work is held in position either for the action of a cutting orgrinding tool or for application of such tool to the work, isnecessarily regulated; and it is designed particularly for' upon thework may be adjusted by the sense of touch of the operator, after which,in case the work-engaging member is a dead center, such member might beclamped in position by independent hand-operated means.

The present invention has for its object to provide the work-engagingmember with means whereby it may be uniformly forced into engagementwith the r work under a predetermined pressure and may be secured insuch operative position independently of any effprt upon the part of theoperator to regulate the character of such engagement.

The invention consists essentially in the combination with thework-engaging' member, of a looking device or clamp for holdingit inengagement with the work, and a member for yieldingly forcing suchworkengaging member into engagement with the work and provided withmeans for positively actuatingsaid locking `dev ice or clamp to maintainsuch engagement.

The invention further includes certain additional con-.

structive features which will be hereinaft'er described.

In the drawings annexed, Figure 1 is an elevation, partly in section, ofthe fail-stock of a latheprovided with my present improvement,representing the workengaging member and coperating parts in operative'elation; Fg. 2 isa rear end view, and Fig. 3 is a plan of the same;Fig. 4 is a side elevation and Fig. 5 a plan of the tail-stock with thework-engaging member in retracted position, and with the coperatingparts in corresponding positions. Figs. G, 7 and 8 are side, end andplan views, similar to Figs. 1, 2 and 3, respectively, of an alternativeform of this improvement; and Figs. 9 and 10 are detail views of thefriction member of the same.

Referring to Figs. 1 to 5 inclusive, the tail-stock comprises the usualsliding head a having the cylindrically bored barrel b in whichvisfitted the sliding sleeve c carrying at its forward end the head-spindled, and having slidably mounted thereon at the opposite end a suitableyielding member or friction-piecc consisting in the present instance ofa split friction-collar e whose lateral ears e are clamped adjustablytogether by means of the bolt f. The collar e is provided upon itsforward end with a cam-projection g and rearwardly thereof with ascrew-pin h entering a slot i of a lever 'i pivoted at one end by meansof a pin j to a projecting arm of a rigid bracket k carried by the heada, the other end of which levert' is provided with a handle l. Aclamp-lever m mounted in the fixed support offered by the ears nprojecting from the barrel b, by means of the pivotal pin o, has at itsrear end a roller p for cooperation with the cam-projection g in tiltingthe clamp-lever m, the opposite end of which lever is forned with a headcomprising a screw bolt q with lock-nut r. To a lateral hole in thebarrel b' is fitted a cyl'indrical plug s constituting a wearing pieceupon which the head of the adjustable bolt q prcsses when the oppositeend of the clamp-lever m engages the cam-projection g. This plug is nota necessary part of the device as the clamp-lever if elongated Would dothe work without it. The sliding sleeve c is provided with astop-shoulder consisting of a collar t fixed thereon near its front endfor engagementwith the adjacent end of the barrel b, and has near itsopposite end a similar collar u to limit the sliding motion of thefriction collar e thereon in its rearward work-releasing movement. Thework A having been engaged by the dead-center d and live spindle w, andthe desired operation thereon having been performed by the usual actionof the tool adapted for such purpose, the shifting of the hand-lever 'ibackwardly operates to first retract the friction coilar e to disengageits cam-projection .g from the roller p, and in the continued movementof the lever i, the sliding movement of the friction collar e isarrested by engagemcnt with the stop-collar u, thereafter causing theretraction of the sleeve c until arrested by engagement of its forwardstop-collar t with the adjacent end of the barrel b, the work beingthereby wholly released for removal from the machine. In introducing thesuccceding piece of work, the operation above described is reversed, thefriction of the collar e upon the sleeve c, in the inital forward motionof the lever i, in-

ducing the advance of the sleeve c until the dead-center 5 screw x; whenthemovements of the lever 'i will be communicated positively to the toolcarried by the sleeve c. g

In the form of the invention represented iii Figs. 6, 7 and 8, theseveral parts operate in the manner above 10 described, but the frictionmember by means oi which the work-engaging member is yieldingly forcedinto operative relation with the work is represented in different form.In these figures, the hollow sleeve Cis shown bored out sufiiciently toreceive an expansible plunger .or plug E mounted upon the forwardtapered portion of a rod F between the cam-piece G and an adjusting nutF' thereon, which rod passes through the screwplug C at the rear end ofthe sleeve C beyond which it carries the collar U having the pin Hentering a hub in the Operating lever I which hasa sliding and swivelconnection J with the-arm K and at the other end the handle L. The splitring constituting the plug E is secured in its desired position ofadjustment against the forward face of the adjusting nut F by means of a25. clamp-nut F As in the Construction previously .de-

s'cribed, the backward shifting of the lever L operates to first retractthe plug E within thehollow sleeve C out of contact with the roller Pcarried by the lever M to release its adjustable head Q and unlock thesleeve C from its work-engaging position, after which the contact of thenut F with the screw-plug C constituting the real' end of the sleeve,arrests the relative motion of the plug E in respect of the sleeve C,but causes the latter to be retracted for release of the work untiLthemotion of bothmembers is finally arrested by means of the stop-collar-T.When the lever I is thrown forward, the sleeve is advanced upon the workuntil firmly engaged therewith, after which the plug E continues itsforward motion sufiiciently tobring the cam- 40 piece G into operativeengagement with the rear end of the lever M, which operates to lock thesleeve G in its forward position, the forward throw of the lever` Ibeing arrested by the engagement of the collar U with the screw-plug CIn this form of the improvement,

the degree of pressure under which the work-engaging member is advancedupon the work is regulated by the longitudinal adjustment oi'the splitring Eupon its conical seat of the rod F, this being varied, as beforeindicated, by varying the position of the adjusting nut F' against whichthe said ring is clamped by means of h clamp-nut F V I have notillustrated he'rein 'the usual spline-andg oove'bonnection between thesliding sleeves and the rrels of the tail-stoc'ks by which they arecarried, to

prevent the rotation of the work-engaging member, as

this feature obviously forms no part oithe present improvernent.

Although the present improvement, as heroin described, is designedparticularlyfor that class of tools in which the device for holding the'work-engagng member in its operative position does not affect theoperation of such member, it is evident that, by so disposing theholding device as to press the work-engaging member upon the work, itwill be readily applicablezto machines involving the employment of aclamping jaw required to close automatically upon articles of varyingsizes and thereby necessitating a variable extent of clamping movementfor such jaw. It is also evident that the characteristic feature of thepresent improvement is the yielding connection between the work-engagingmember and its actuatng means, to insure the engagement of the workunder a regulated or predetermined pressure, in combination with a'detent device connected therewith, whether directly or indirectly, forlooking such work-engaging member in operative engagement with the work,whereby the locking of the work-engaging member normally succeeds theadvancement of such member upon the work.

From the foregoing description it will be readily seen that the presentinvention is not limited to the specific features of Construction hereinshown and described, but is susceptible of considerable variation inConstruction and arrangen'lent of its Component parts and the uses towhich it may be adapted.

Having thus set forth the nature of my invention, what I claim heroinis,-

1. In a machine tool, the combination with a work-engaging member, of adevice for holding it in engagement with the work, and a member foryieldingly forcing the said work-engaging member into engagement withthe work and which is provided with means for actuating the holdingdevice. 4

2; In a machine tool, the combination with a work-engaging member, of alooking device for maintaining it in operative position, and a meniherfor forcing said workengaging member into engagement with the work and.provided with means for regulating the pressure of said work-engagingmember upon the work and with means for actuating said locking device.

3. In a machine tool, the combination with a reciprocating work-engagingmember, of a looking device for holding the same in operative position,a frict'ion member mounted slidably upon said work-engaging member andcarrying means for positively actuating said looking device, and meansfor reciprocating said f'iction member to successively op'erate saidwork-engaging member and its looking device.

4. In a machine tool, the combination with a reciprocating work-engagingmember, of a looking device for 'holding the .same in operativeposition, a split collar carrying means for actuating said lockingdevice, mounted slidably upon said work-engaging member and providedwith means for varying its frictional hold upon said -work-engagingmember, and means for reciprocating said collar.

In a machine tool, the combination with a reciprocat-' ing work-engagingmember provided with a stop to arrest its retractive movement, of alocking device for holding it in operative position, and a member forforcing said workengaging member into engagement with the work andprovided with means for regulating the pressure of said workengaging'member upon the work andwlth means for actuating said `looking device.I

6. In a mac hine tool, the combination with a reciprocatingwork-engaging member, of a locking device for holding it in operativeposition, a friction-member fitted slidably to saidwork-engaging memberand carrying means for actuating said locking device, and stopsOperating respectively to positively arrest the relative movement ofsaid friction member in respect of, and the actual movement of, thework-engaging member in ;the disengagement of thesame from thework. i

7. In a machine tool, the combination with a reciprocating work-engagingmember, of a f-iction collar provided with a cam-projection and fittedslidably upon said workengaging member, means for reciprocatingsaidfrlction collar, and acIamp-lever pivotally mounted-upon a fixedsupport with one end lying in the path of movement of said camprojectionand the other end adapted for applying lateral pressure to saidwork-engaging member.

8. In a machine tool, the combination with a reciprocat- &69,588

ing work-engaging member, of a friction coliar provided with 21cam-projection and fitted slidably upon said workengaging member, meansfor reciprocating said f'iction coilar, and a cIamp-iever pivotaiiymounted upon a`fixed support withone end lying in the path ofrmovementof said cam-projection and the other end provided with an adjustablehead for appiying laterai pressure to said work engaging member.

9. In a machine tooi, the combination with a reciprocating work-engzgingmember, of a iocking device for holding it in operative position, africtiommember {ittedslidnbly to said work-engaging member and providedwith means for actuuting said looking device, means whereby saidfriction-member may be prevented from sliding upon the work-engngingmember, and means for reciprocating said friction-member.

10. In a machine tool, the combination with the workengaging member andmeans for locking it in position, of common operative means having ayielding connection with said work-engaging member for communicntingthereto movements upon the work variable in extent and adapteq forpositivly actuating said looking member to 'etain the work-engzgingmember in operative relaton with said work.

11. In a machine tool, the combination With the workengaging member andmeans for locking the same in position, of common operative means havinga yielding connection with said work-engaging member for communicatingthereto movements to and from the work variabie in extent, and adaptedfor positiveiy acjuating said looking means to lock and uniock the saidWork-engaging member when in operative reiation with the work.

12. In a machine tooi, the combination with the workengaging member andmeans for looking it in position, of common operative means constructedand arranged to act by a single continuous .movement in successiveiymoving said work-engaging member yieidingly upon the work and positivelyactuating said looking member to retain the work-engaging member inoperative reiation with said work.

13. In a machine tooi, the combination with a work-engaging member, ofOperating means having a yieldabie connection with the work-engagingmember and arranged to be maintained against movenent relative to saidmember by a measnred resistance and :daptedto force snid work-engsgingmember into engagement with the work with a predetermined thrnst, and aholding device with actuatin'g ineans therefor operatively connectedwith said Operating means whe'eby said engagement of the work-enagingmember with the work is maintained.

in testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

FRIEDERICH MLLER.

Witnesses I'IENRY J. MILLEn, H. C. KORNEMANN.

